Assistance with understanding php urls -


i'm looking @ websites use php , seea[]=val1 instead ofb=val2. question why there brackets in url? type of code produce effect?

why brackets in url?

the brackets in url indicate val1 assigned next position in array a. if confused blank part of bracket, @ how php arrays work.

what kind of code produce this?

as code create such url, either explicit definition coder or other script, or somehow created form using method="get" attribute.


example:

to create this, can define array name of input field so:

<form method="get"> <input name="a[]" ... /> <input name="a[]" ... /> <input name="a[]" ... /> </form>

or can make link (the a tag) url:

<a href="foo.php?a[]=val1&a[]=val2&a[]=val3">click me!</a>


parse url php, use $_get variable retrieve values url:

<?php $a = $_get['a']; $val1 = $a[0]; $val2 = $a[1]; $val3 = $a[2]; ... print_r($a); ?>

the printout of print_r($a) statement (if wrapped in <pre> tag):

array ( => array ( 0 => 'val1', 1 => 'val2', 2 => 'val3' ) )

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